There was actually TWO Earthquakes here in SO Cal jsut now - within ONE MINUTE of each other
http://earthquake.usgs.gov/recenteqs...at00000169.htm
Magnitude 5.1 - OFFSHORE BAJA CALIFORNIA, MEXICO
2004 June 15 22:28:48 UTC
Preliminary Earthquake Report
West Coast and Alaska Tsunami Warning Center/NOAA/NWS
A moderate earthquake occurred at 22:28:48 (UTC) on Tuesday, June 15, 2004. The magnitude 5.1 event has been located OFFSHORE BAJA CALIFORNIA, MEXICO. (This event has been reviewed by a seismologist.)
AND
http://earthquake.usgs.gov/recenteqs...ci14065544.htm
Magnitude 4.7 - SOUTHERN CALIFORNIA
2004 June 15 22:29:25 UTC
Preliminary Earthquake Report
California Integrated Seismic Net
USGS/ Caltech/ CGS/ UCB/ UCSD/ UNR
A light earthquake occurred at 22:29:25 (UTC) on Tuesday, June 15, 2004. The magnitude 4.7 event has been located in SOUTHERN CALIFORNIA. The hypocentral depth was estimated to be 25 km (16 miles). (This is a computer-generated message -- this event has not yet been reviewed by a seismologist.)